River Hernád is a transborder running water of Slovakia and Hungary. The drainage
basin of the river include lot of tributaries which are under researched therefore
our knowledge about of the fish fauna of the streams is incomplete. Hence in this
investigation we wanted to estimate the fish fauna of the streams and accomplished
the ecological assessment of the tributaries based on fish data. The samplings were
made at autumn in 2019. The longness of the sampling sections was 150 m by wading
and the sampling method based on the European Water Framework Directive for fish examination.
According to our results fish assemblage of the streams are diverse most of the time,
but sometimes these assemblages contain just one species, as follow the assessment
is beyond possibility. Most of the species are protected by nature conservation and
they are so sensitive for the changes of their environment, therefore they are good
indicators of the changes in the ecological assessment. Overall, the ecological surveying
of the tributaries of River Hernád shows that these natural habitats have good ecological
conditions. During the sampling we identified just 3 invasive species (stone moroko,
prussian carp, pumpkinseed). Because of the intensifying anthropogenic effects these
ecosystems are critically.
